. >> wednesday, president obama and mitt romney meet in their first presidential debate. the news hour's jim lehrer moderates from the university of denver. watch and engage with c-span, including our live debate preview at 7:00 p.m. eastern, the debate at 9:00, and post-debate, your reactions, calls, and emails and tweets. follow our live coverage on c-span, c-span radio, and online at c-span.org. >> september 11, 2001, was a day that changed my life forever. it changed america's life. i'm going to go through a power point presentation, which is going to outline the account, the historical account of the attack as things happened, as things transpired that day. it gets pretty intense. a lot of things happened very quickly. i'm going to do my best not to ramble on and go too fast, but i would ask to you sit back, clear your mind, put yourself in that room, and you'll get a real sense of what it was like to be at the top of the food chain, the national command authority, as a nation of 300 million americans was attacked by 19 al qaeda terrorists. >> more from retired lieut